SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f2f5cea76f1e1ebd1357e5f74eb3a7a588ba9d5bd5644198f3098674e9bbd31' 
  AND token = 'KU6+AwQiOncDouHGPhugLWUgNgL/l8VY/5RF+2lHznE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}